Apparatus for photographically recording sound



Aug. 23, '1932. F. HEHLGANS ,8

APPARATUS FOR PHOTOGRAPHICALLY RECORDING SOUND Filed Oct. 5, 1931,

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DDUDDDDUDUUDDD Inventor: F'T'iedr'ich Hehhgans,

His At t or'neg.

Patented Aug. 23, 1932 UNITED STATES PATENT OFFICE FRIEDRICH HEHLGANS, F BEBLIN-HEBMSDOBF, GERMANY, ASSIGNOR T0. GENERAL ELECTRIC COMPANY, A CORPORATION 01 NEW YORK APPARATUS IIOB PHOTOGRAPHICALLY RECORDING SOUND Application filed October 5, 1981, Serial Ho. 567,011, and in Germany October 8, 1980.

invention relates to apparatus for photographically recording sound on a movmg li ht sensitive member and simultaneously' ma 'n identification marks on the memlj ber. Suc marks are useful in designating different sound recordin which may be made on the same film. hey are also useful in assembling sound and picture negati'ves in the makmg of a combmed rint of 1 such records, as explained for exam e in the Bullis Patent 1,335,651 and in the Villiams Patent 1,389,407. It is the ob'ect of my invention to provide an improve apparatus of this character which is simple in construc- 1 tion, compact in form and inexpensive to manufacture.

My invention will be better understood from the following description taken in connection with the accompanying drawing, and its scope will be pointed out in the appended claims.

While my invention is applicable to various difierent forms of sound recording apparatus I have chosen to illustrate it as constituting a part of a common form of recording apparatus which em loys a light source of constant intensity an varies a light beam therefrom for making the record by means of a Kerr cell. Referring now to the drawing, Fig. 1 illustrates such an embodiment of my invention and Fig. 2 shows a portion of the light sensitive member. This member 1, such for example as a film of the motion picture type, is shown supported by the roller 2 at the ints at which the sound record and the identlfication marks are made.

speed by suitable means not shown. Light of the sound record and the identification marks is supplied from the single light'source 3 which'may be an electric lamp which in .Beyond the apparatus 6 the light is refracted- The mem-, her 1 is adapted to be driven at a uniform for exposing the member 1 for the making by the prism 10 to prism 11 from which it passes t rough the partially reflecting mirror 12 to the light sensitive member 1 upon which it is focused by suitable and well known means, not shown, to enable the recording of the sound waves.

From the same light source 3 light rays pass through the condensing lens 14 to rism 15, through control device 16, lenses 1 and prlsm 18 to the light sensitive member 1 engaging the same at the point 19. This point preferably is at a marginal portion of the member 1 or at least at some portion thereof not occupied by the sound record. The control member 16 may be any suitable device.

It magebe manually operated or, if referred, may automatically operated. e light flashes by which the identification marks are made under the control of member 16 may for example be in the form of dots and dashes as shown at 20 in accordance with a code such as the Morse code.

I have chosen the particular embodiment described above as illustrative of my invention and it will be apparent that various other modifications may be made without departing from the spirit and scope of my invention which modifications I aim to cover by the appended claims.

What I claim as new and desire to secure by Letters-Patent of the United States is:

1. Apparatus for recordingsound on a moving light sensitive member comprising a, light source, means for directing light from said source on the member for recording sound and means for directing light from the same. source on the member for producing identification marks thereon.

2. Apparatus for recording sound on a moving light sensitive member comprising a light source, means for variably exposing one portion of said member to light from said source in accordance with the sound to be recorded and means for exposing another portion of said member tolight from said same source to produce identification marks thereon.

3. Apparatus for recording sound on a moving light sensitive member comprising a light source, means for varying a beam of light from said source in accordance with the sound waves and directing it upon the member, means for directing another beam from said source on said member and means for varying said other beam.

portion of said film, said means comprising a lens and a prism for directing on said other portion a light beam from said source independent of said first beam.

In witness whereof, I have hereunto set my hand.

FRIEDRICH HEHLGANS. 

